A systematic study of a series of InGaAs/GaAs lasers in the 1−1.3 µm optical range based on quantum wells (2D), quantum dots (0D), and quantum well-dots of transitional(0D/2D) dimensionality is presented. In a wide range of pump currents, the dependences of the lasing wavelength on the layer gain constant,
a parameter which allows comparing lasers with different types of active region and various waveguide designs, are measured and analyzed. It is shown that the maximum optical gain of the quantum well-dots is significantly higher, and the range of lasing rawavelengths achievable in edge-emitting lasers without external resonators is wider than in lasers based on quantum wells and quantum dots.
We have studied superluminescent diodes with simplified design and active region based on 5 or 7 layers of InGaAs/GaAs quantum well-dots (QWDs). Emission peaks of the individual QWD layers are shifted with respect to each other by 15-35 nm to provide as wide as possible emission line in a superluminescent mode with central wavelength of about 1 µm without significant spectral dips. For superluminescent diodes with the active region based on 5 and 7 QWD layers, the maximal value of full width at half maximum of emission spectrum was 92 and 103 nm respectively.
An improved technique for thermal resistance mea-
surement of edge-emitting diode lasers using spontaneous emission
spectra, collected through the opening in the n-contact within the
range of operating currents, has been proposed. The advantage
of the proposed technique is that systematic errors typical for
measurements based on lasing spectra are excluded. The accuracy
of the method was verified by measuring the dependence of
the thermal resistance on the cavity length for diode lasers with
100 μm strip width. Obtained results are in good agreement with
the model, and the minimum measurement error was ±0.1 K/W.
The proposed technique can be used in metrological support of
fabrication process of semiconductor lasers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.